Benign focal liver lesions: The role of magnetic resonance imaging

Figure 5 A 56-year-old female with ultrasound evidence of a hyperechoic nodular lesion in S8. Liver magnetic resonance imaging confirmed a nodule, slightly hypointense on T1-weighted, slightly hyperintense on T2-weighted sequences, without increased signal intensity on diffusion weighted images. After gadoxetic acid administration, the lesion shows homogeneous arterial enhancement, becomes isointense during the portal venous phase, and presents peripheral hyperintensity with a hypointense core on the hepatobiliary phase. Such findings are consistent with atypical focal nodular hyperplasia. A: In-phase T1-weighted image; B: Out-of-phase T1-weighted image; C: T2-weighted image; D: T2-Spectral Attenuated Inversion Recovery; E: High b-value diffusion weighted imaging; F: Pre-contrast phase magnetic resonance imaging (MRI); G: Arterial phase MRI; H: Portal venous phase MRI; I and J: Hepatobiliary phase MRI.